* {
  margin: 0;
  height: 0;
  box-sizing: border-box;
}

.App {
  height: 100vh;
  width: 100vw;
  background-color: darkblue;
}

header {
  height: 12vh;
  width: 100vw;
  background-image: url("./assets/header.png");
  background-size: 100% 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  color: #fff;
  /* 字体大小用vmin或者vmax */
  font-size: 3vmin;
}

main {
  height: 88vh;
  width: 100vw;
  display: flex;
}

.left {
  width: 30vw;
  height: 88vh;
  display: flex;
  flex-direction: column;
  justify-content: space-evenly;
  align-items: center;
}

.left-top {
  width: 24vw;
  height: 34vh;
  background-image: url("./assets/kuang.png");
  background-size: 100% 100%;
}

.left-bottom {
  width: 24vw;
  height: 42vh;
  background-image: url("./assets/kuang.png");
  background-size: 100% 100%;
}

.center {
  width: 40vw;
  height: 88vh;
  background-color: fuchsia;
}

.right {
  width: 30vw;
  height: 88vh;
  background-color: goldenrod;
}
